Image display device

ABSTRACT

A liquid crystal display device includes a first substrate and a second substrate with a liquid crystal layer therebetween, a seal material joining the first substrate and the second substrate to each other, a plurality of gate signal lines and a plurality of drain signal lines, wherein the gate signal lines and the drain signal lines being formed on the first substrate, and a plurality of drive circuits connected to the first substrate. Data transmission signal lines are formed on the first substrate, wherein the data transmission signal lines are connected electrically between the drive circuits, and at least a part of at least one of the data transmission signal lines is positioned between the seal material and the first substrate.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. application Ser.No. 10/695,832, filed Oct. 30, 2003, now U.S. Pat. No. 7,403,193, thecontents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

The present invention relates to an image display device, and, moreparticularly, to an image display device of the type which is referredto as an active matrix type image display device, for example.

A typical active matrix type liquid crystal display device includes,inside of the panel thereof, gate signal lines which supply scanningsignals to a pixel group consisting of respective pixels which arearranged in parallel in one direction and drain signal lines whichsupply video signals to the respective pixels to which the scanningsignals are supplied.

Each pixel has a switching element which is operated in response toreceipt of the scanning signal, a pixel electrode to which signals fromthe drain signal lines are supplied through the switching element, and acounter electrode which generates an electric field for controlling theoptical transmissivity of the liquid crystal material disposed betweenthe pixel electrode and the counter electrode.

The supply of the scanning signals to the gate signal lines and thesupply of the video signals to the drain signal lines are respectivelyperformed by a scanning signal drive circuit and a video signal drivecircuit, each of which is constituted of semiconductor devices which aremounted on a surface of one of the substrates of the panel on which thegate signal lines and the drain signal lines are formed (hereinafter,these circuits will be simply referred to as signal drive circuits insome cases).

Here, each of the scanning signal drive circuit and the video signaldrive circuit is constituted of a plurality of semiconductor devices.Further, a number of signal lines which are arranged adjacent to eachother are formed into a group, and one semiconductor integrated deviceis allocated to each group.

In this case, the plurality of respective semiconductor devices whichconstitute the video signal drive circuit, for example, are configuredsuch that data is transmitted through a data transfer signal linebetween each semiconductor device, and another neighboring semiconductordevice whereby the cumbersomeness of the constitution which suppliessignals independently to respective semiconductor devices is obviated.

SUMMARY OF THE INVENTION

First of all, the inventors of the present invention have discovered aphenomenon in which, during the manufacturing process used in thefabrication of the image display device having constitution, a sparkattributed to static electricity is generated between a data transfersignal line and a drain signal line which is arranged adjacent to thedata transfer signal line, with the result that these lines aredisconnected.

When the inventors pursued a cause of this phenomenon, following factwas discovered. That is, during the manufacturing process, the substraterepeats attraction and peeling-off thereof with respect to a metal-madefixing portion which supports the substrate, so that static electricityof high voltage, which is referred to as a so-called peel-off charge, isapplied to the whole substrate.

In this case, there is a large difference between the area for therespective data transfer signal lines which are formed as a group ofdata transfer signal lines and the area for the respective drain signallines which are formed as a group of drain signal lines, for example,adjacent to the group of data transfer signal lines. This is because,while the group of data transfer signal lines is formed in the peripheryof the substrate, the group of drain signal lines extend across thepanel.

Accordingly, there is a large difference between the quantity of staticelectricity which is charged to a group of data transfer signal linesand the quantity of static electricity which is charged to a group ofdrain signal lines; and, hence, a spark is liable to easily occurbetween a data transfer signal line and a drain signal line which arearranged adjacent to each other.

Further, during the manufacturing process, when the data transfer signallines are isolated every other line and the drain signal linestemporarily adopt a constitution in which the drain signal lines areconnected to each other using a common line, while the potential of thedrain signal lines rapidly approaches 0, the potential of the datatransfer signal lines is held at a high level. Accordingly, a potentialdifference of high voltage is generated between the data transfer signallines and the drain signal lines; and, hence, a spark is liable to occurbetween a data transfer signal line and a drain signal line which arearranged adjacent to each other.

The present invention has been made in view of such circumstances, andit is an object of the present invention to provide an image displaydevice in which, when a first group of signal lines and a second groupof signal lines which differ in length from the first group of signallines are arranged adjacent to each other, it is possible to prevent adisconnection attributed to static electricity generated by theoccurrence of a spark between a signal line of the first group of signallines and a signal line of the second group of signal lines which arearranged adjacent to each other.

Typical examples of the invention disclosed in this specification are asfollows.

Example 1

According to the image display device of the present invention, forexample, a first signal line group constituted of a plurality of firstsignal lines which are arranged in parallel and a second signal linegroup constituted of a plurality of second signal lines which arearranged in parallel in a region adjacent to the group of first signallines are formed on a substrate, and a dummy line is arranged betweenthe first signal line group and the second signal line group.

Example 2

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 1, characterizedin that both ends of the dummy line are not connected to other signallines.

Example 3

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 1, characterizedin that the dummy line has respective portions thereof connected to thefirst signal lines and the second signal lines which are arrangedadjacent to the dummy line.

Example 4

The image display device according to the present invention is, forexample, on the premise of the constitution of any one of Examples 1 to3, characterized in that the dummy line is constituted of a plurality oflines which are arranged in parallel.

Example 5

The image display device according to the present invention is, forexample, characterized in that a drive circuit which supplies signals torespective pixels in an image display part of a substrate through signallines is formed outside the image display part, the drive circuit isconstituted of a plurality of semiconductor devices, these respectivesemiconductor devices are configured such that data is supplied betweenthese respective semiconductor devices and other semiconductor deviceswhich are arranged adjacent to these respective semiconductor devicesthrough data transfer signal lines, and a dummy line is formed betweenthe signal lines and the data transfer signal lines.

Example 6

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 5, characterizedin that the signal lines are drain signal lines which supply videosignals to respective pixels, and the drive circuit constitutes a videosignal drive circuit.

Example 7

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 5, characterizedin that the signal lines are gate signal lines which supply scanningsignals to respective pixels, and the drive circuit constitutes ascanning signal drive circuit.

Example 8

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 5, characterizedin that the signal lines which are arranged adjacent to each other areformed into a group, the signal lines which are formed into each groupare directed in the converging direction outside the image display partand are connected to the respective semiconductor devices, and datatransfer signal lines which connect between one semiconductor device andanother semiconductor device, arranged adjacent to the one semiconductordevice, are formed such that the data transfer signal lines loop aroundan area at the image display part side between these respectivesemiconductor devices.

Example 9

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 5, characterizedin that the dummy line is connected with the signal lines which arearranged adjacent to the dummy lines.

Example 10

The image display device according to the present invention is, forexample, on the premise of the constitution of Example 9, characterizedin that the connection between the dummy lines and the signal lines areestablished at the image display part side.

Example 11

The image display device according to the present invention is, forexample, characterized in that a pair of electrodes are formed on eachpixel within an image display part of a substrate, one of the pair ofelectrodes includes a counter electrode to which a counter voltagesupply signal which becomes a reference with respect to signals suppliedto another electrode of the pair of electrodes is supplied, a drivecircuit which supplies signals to the respective pixels through signallines is formed outside the pixel display part, the drive circuit isconstituted of a plurality of semiconductor devices, a counter voltagesupply signal line which supplies counter voltage supply signals to thecounter electrode is formed on a region between the semiconductor deviceand another semiconductor device which is arranged adjacent to theformer semiconductor device, and a dummy line is arranged between thesignal lines and the counter voltage supply signal line.

The present invention is not limited to the above-mentionedconstitutions and various modifications are conceivable withoutdeparting from the scope of technical concept of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view showing a representative part of one embodiment ofan image display device according to the present invention and is a viewcorresponding to a portion A in FIG. 3;

FIG. 2A is a plan view showing one embodiment of the overall structureof the image display device according to the present invention, and FIG.2B is a schematic circuit diagram of a pixel in the area B in FIG. 2A;

FIG. 3 is a plan view showing another embodiment of the overallstructure of the image display device according to the present inventionand is a view obtained by simplifying the structure seen in FIG. 2A;

FIG. 4 is a plan view of an image display device showing an advantageouseffect of the present invention;

FIG. 5 is a plan view showing a product to which the present inventionis applied showing structure corresponding to FIG. 1;

FIG. 6 is a plan view showing a product to which the present inventionis not applied showing structure corresponding to FIG. 4;

FIG. 7 is a plan view showing a representative part of one embodiment ofthe image display device according to the present invention;

FIG. 8 is a plan view showing a representative part of one embodiment ofan image display device according to the present invention;

FIG. 9 is a plan view showing a representative part of one embodiment ofthe image display device according to the present invention;

FIG. 10 is a plan view showing a representative part of one embodimentof the image display device according to the present invention; and

FIG. 11 is a plan view showing a representative part of one embodimentof the image display device according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of an image display device of the presentinvention will be explained in conjunction with the drawings. In theexplanation presented hereinafter, a liquid crystal display device willbe considered as an example.

Embodiment 1

<<Overall Constitution>>

FIG. 2A is a plan view showing one embodiment of a liquid crystaldisplay device according to the present invention, and FIG. 2B shows aportion thereof in the form of an equivalent circuit.

In the drawing, a pair of transparent substrates SUB1, SUB2 are arrangedto face each other with liquid crystal material sandwiched therebetween,wherein the liquid crystal material is sealed by use of a sealingmaterial SL, which also performs the function of fixing the transparentsubstrate SUB2 to the transparent substrate SUB1.

On a liquid-crystal-side surface of the transparent substrate SUB1, inthe area surrounded by the sealing material SL, gate signal lines GLwhich extend in the x direction and are arranged in parallel in the ydirection and drain signal lines DL which extend in the y direction andare arranged in parallel in the x direction are formed. Regions definedby adjacent gate signal lines GL and adjacent drain signal lines DLconstitute pixel regions, and a mass of these pixel regions in a matrixarray constitute a liquid crystal display part AR.

Further, on respective pixel regions which are arranged in parallel inthe x direction, a common counter voltage signal line CL runs in theinside of respective pixel regions. This counter voltage signal line CLconstitutes a signal line which is used for supplying a voltage whichbecomes a reference with respect to video signals to counter electrodesCT in each pixel region, as will be described later.

In each pixel region, there are a thin film transistor TFT, which isdriven by scanning signals from one-side gate signal line GL, and apixel electrode PX to which the video signals from one-side drain signalline DL are supplied through the thin film transistor TFT. An electricfield is generated between the pixel electrode PX and the counterelectrode CT, which is connected to the counter voltage signal line CL,and the optical transmissivity of the liquid crystal material iscontrolled in response to the electric field.

Respective ends of the gate signal lines GL extend beyond the sealingmaterial SL, and these extended ends constitute terminals GLT, to whichoutput terminals of a scanning signal drive circuit V are connected.Further, to input terminals of the scanning signal drive circuit V,signals are inputted from a printed circuit board (not shown in thedrawing) which is arranged outside the liquid crystal display panel.

The scanning signal drive circuit V is constituted of a plurality ofsemiconductor devices, wherein a plurality of gate signal lines GL,which are arranged adjacent to each other, are formed into a group, andone semiconductor device is allocated to each group.

In the same manner, respective ends of the drain signal lines DL extendbeyond the sealing material SL, and these extended ends constituteterminals DLT, to which output terminals of a video signal drive circuitHe are connected. Further, to input terminals of the video signal drivecircuit He, signals are inputted from a printed circuit board (not shownin the drawing) which is arranged outside the liquid crystal panel.

The video signal drive circuit He is also constituted of a plurality ofsemiconductor devices, wherein a plurality of drain signal lines DL,which are arranged adjacent to each other are formed into a group, andone semiconductor device is allocated to each group.

Further, the counter voltage signal lines CL have right-side endportions thereof, as seen in the drawing, commonly connected, and aconnection line extends beyond the sealing material SL, with an extendedend of the connection line constituting a terminal CLT. A voltage whichbecomes the reference with respect to the video signals is supplied fromthe terminal CLT. The respective gate signal lines GL are sequentiallyselected one after another in response to the scanning signal lines fromthe scanning signal drive circuit V.

Further, to respective drain signal lines DL, video signals are suppliedat the selection timing of the gate signal lines DL from the videosignal drive circuit He.

<<Signal Drive Circuit>>

FIG. 3 is a plan view of the liquid crystal display device similar to asFIG. 2A. This drawing shows a constitution in which the scanning signaldrive circuit V is constituted of a plurality of semiconductor devices,and these semiconductor devices are arranged in parallel in the ydirection on the transparent substrate SUB1; and, in the same manner,the video signal drive circuit He is constituted of a plurality ofsemiconductor devices, and these semiconductor devices are arranged inparallel in the x direction on the transparent substrate SUB1.

Further, the drain signal lines DL, which are pulled out from the liquidcrystal display part AR side are formed in groups in a converging mannerand are directed to a respective semiconductor device together withother drain signal lines DL which are arranged adjacent to each otherand are formed into a group. This is because the pitch of the bumps ofthe semiconductor device to which respective drain signal lines DL areconnected is smaller than the pitch of the respective drain signalslines DL in the liquid crystal display part AR.

In the same manner, the gate signal lines GL, which extend out from theliquid crystal display part AR side, are formed in groups in aconverging manner and are directed to a respective semiconductor devicetogether with other gate signal lines which are arranged adjacent toeach other and are formed into a group.

Further, in this embodiment, among the semiconductor devices whichconstitute the video signal drive circuit He, a data transfer signalline DTL, which connects one semiconductor device to anothersemiconductor device that is arranged adjacent to the formersemiconductor device, is formed on the transparent substrate SUB1. Thesignals are sequentially supplied to respective semiconductor devicesthrough the data transfer signal line DTL, thus avoiding thecumbersomeness of supplying signals independently to respectivesemiconductor devices.

In the same manner, also with respect to the semiconductor devices whichconstitute the scanning signal drive circuit V, the data transfer signalline DTL, which connects one semiconductor device to anothersemiconductor device that is arranged adjacent to the formersemiconductor device, is formed on the transparent substrate SUB1.

<<Arrangement Relationship Between Drain Signal Lines and Data TransferSignal Lines>>

FIG. 1 is a view showing the details of the arrangement and relationshipbetween the drain signal lines DL and the data transfer signal linesDTL, and FIG. 1 is an enlarged view of a portion A shown in FIG. 3.

In the drawing, the drain signal line DL (R) group at the right side inthe drawing is directed to the semiconductor device arranged at theright side in the drawing (although it is not shown in the drawing) and,hence, they are formed to have two bent portions, for example. That is,each drain signal line DL, which extends from the liquid crystal displaypart AR side, has its direction changed in the direction that the drainsignal lines DL are converged to each other at the first bent portionand subsequently runs while the direction thereof changes to the bumpside to be connected to the semiconductor device directly by the nextbent portion.

In the same manner, the drain signal line DL (L) group at the left sidein the drawing is also formed such that the group runs while having twobent portions, for example, to direct the drain signal line DL (L) groupto the semiconductor device arranged at the left side in the drawing(although it is not shown in the drawing). Here, in this embodiment,respective bent portions of each drain signal line are configured to bepositioned within a region where the sealing material SL is formed.

Thus, a region in which the drain signal lines DL are not formed isprovided between the drain signal line DL (R) group and the drain signalline DL (L) group, which are directed in different directions, that is,in the right and left directions, while the data transfer signal lineDTL group, which connects respective semiconductor devices arrangedadjacent to the region, is formed such that they loop around the regionbetween semiconductor devices.

The reason why the data transfer signal line DTL group is formed in sucha roundabout manner is to reduce the width of the peripheral side of thetransparent substrate SUB1 with respect to respective semiconductordevices which constitute the video signal drive circuit He, for example,so as to narrow the peripheral region, which is referred to as aso-called picture frame.

Accordingly, only a slight gap is formed between a drain signal line DLwhich is arranged at the side of the drain signal line DL group, whichis connected to each semiconductor device as a group, and a datatransfer signal line DTL which is arranged at the side of the datatransfer signal line DTL group.

In this case, a large difference exists between the length of each drainsignal line DL and the length of each data transfer signal line DTL.Accordingly, the quantity of the charge that is charged to the drainsignal line DL group due to static electricity and the quantity of thecharge that is charged to the data transfer signal line DTL group due tostatic electricity will differ largely; and, hence, as shown in FIG. 4,which corresponds to FIG. 1, a spark SP is generated due to staticelectricity between the drain signal line DL and the data transfersignal line DTL which are arranged to adjacent to each other, so thateither one of the signal lines may be disconnected.

Accordingly, in this embodiment, as shown in FIG. 1, in theabove-mentioned gap, a so-called dummy line DLY is formed along therunning direction of the drain signal line DL which is arranged at theside of the drain signal line DL group, for example. Here, the dummyline DLY is a line which does not contribute to signal transfer. In thisembodiment, both ends of the dummy line DLY are not connected to anyother lines.

Due to such a constitution, a spark can be generated between the drainsignal line DL, which is arranged at the side of the drain signal lineDL group, and the dummy line DLY which is arranged adjacent to the drainsignal line DL, and, hence, disconnection of the drain signal line DLcan be prevented. Further, a spark can be generated between the datatransfer signal line DTL, which is arranged at the side of the datatransfer signal line DTL group, and the dummy line DLY, which isarranged adjacent to the data transfer signal line DTL, and, hence,disconnection of the data transfer signal line DTL can be prevented.

Here, in applying the present invention to an actual product, theconstitution which corresponds to FIG. 1 is shown in FIG. 5, and theconstitution which corresponds to the constitution shown in FIG. 5, andis not provided with the dummy line DLY, is shown in FIG. 6.

Embodiment 2

FIG. 7 is a view showing another embodiment of the image display deviceaccording to the present invention, which is similar to that of FIG. 1.

The feature which makes this embodiment different from the constitutionshown in FIG. 1 lies in the fact that the dummy line DLY is electricallyconnected to the neighboring drain signal line DL through a connectingportion JK. Due to such a connection, the potential of the dummy lineDLY can be set to be equal to the potential of the drain signal line DLwhich is positioned at the side of the drain signal line DL group, and,hence, the potential of the dummy line DLY can be made stable.Accordingly, a spark attributed to static electricity can be surelygenerated at the dummy line DLY.

In this case, the line width of the drain signal line DL is generallyset to be smaller than the line width of the data transfer signal lineDTL. Further, it is preferable that the line width of the dummy line DLYis set to a value which is ¾ to 5/4 of the line width of the drainsignal line DL. This provision is made to make the capacitance of thedrain signal line DL, which is electrically connected to the dummy lineDLY, approximate to the capacitance of the other drain signal line DL.Due to such a constitution, the luminance can be made uniform.

Embodiment 3

FIG. 8 is a view showing another embodiment of the image display deviceaccording to the present invention, which is similar to that of FIG. 7.

In the same manner as the embodiment shown in FIG. 7, although the dummyline DLY is connected to the drain signal line DL which is arrangedadjacent to the dummy line DLY, the connecting portion JK is provided toan end portion at the liquid crystal display part AR side and is notprovided to the end portion at the peripheral side of the transparentsubstrate SUB1.

Due to such a configuration, the disconnection of the dummy line DLY bysparking occurs at a position close to the liquid crystal display partAR. On the other hand, if the disconnection of the dummy line DLY wereto occur at the peripheral side of the transparent substrate SUB1, thereexists the possibility that the so-called electrolytic corrosion will begenerated at the disconnected portion and that the electrolyticcorrosion will progress from the disconnected portion.

Further, the side of the dummy line DLY which is close to the liquidcrystal display part AR is covered with the sealing material SL, thusensuring a state in which electrolytic corrosion is hardly generatedfrom that side even when the disconnection is generated.

Embodiment 4

FIG. 9 is a view showing another embodiment of the image display deviceaccording to the present invention, which is similar to that of FIG. 8.

The feature which makes this embodiment different from the embodimentshown in FIG. 8 lies in the fact that when the dummy line DLY shown inFIG. 8 is used as a first dummy line DLY1, a second dummy line DLY2 isprovided adjacent to the first dummy line DLY 1. Further, the seconddummy line DLY2 is connected to the first dummy line DLY1 at an endportion on the liquid crystal display part AR side.

Due to such a constitution, the function of the dummy line DLY isfurther strengthened.

Embodiment 5

FIG. 10 is a view showing another embodiment of the image display deviceaccording to the present invention, which is similar to that of FIG. 9.

The construction which makes this embodiment different from theembodiment shown in FIG. 9 lies in the fact that the connection of thesecond dummy line DLY2 with the first dummy line DLY1 is not made at theend portion near the liquid crystal display part AR side, but is made atone end near the peripheral side of the transparent substrate SUB1.

Due to such a connection, even when a disconnection is generated at thesecond dummy line DLY2 by sparking, the electrolytic corrosion which isgenerated at such a portion must go through the first dummy line DLY1 toreach the drain signal line DL, and, hence, the propagation of theelectrolytic corrosion becomes difficult structurally.

Embodiment 6

FIG. 11 is a view showing another embodiment of the image display deviceaccording to the present invention, which is similar to that of FIG. 1.

The feature which makes this embodiment different from the embodimentshown in FIG. 1 lies in the fact that between respective semiconductordevices which constitute the video signal drive circuit He, there existsome portions where the above-mentioned data transfer signal line DTL isnot arranged and the counter voltage signal line CL is arranged instead.

In this embodiment, the portion where the counter voltage signal line CLis arranged is shown in the drawing. The counter voltage signal line CLis formed as a layer equal to the drain signal line DL, for example, andis formed as a layer (an upper layer) different from that of the counterelectrode CL which extends to the liquid crystal display part AR side byway of an insulation film.

Accordingly, the counter voltage signal line CL is electricallyconnected to the counter electrode CT through a contact hole CH formedin the insulation film. Here, since the drain signal line DL group isarranged around the counter voltage signal line CL, the above-mentioneddrawback arises due to the difference in the charge quantity of staticelectricity between them. Accordingly, also in this embodiment, thedummy line DLY is provided between the counter voltage signal line CLand the drain signal line DL group.

It is needless to say that the technical concept employed in theabove-mentioned embodiments is also applicable to the specificconstitution of the dummy line DLY in this embodiment.

The above-mentioned respective embodiments are directed to constitutionswhich prevent a disconnection or the like attributed to a sparkgenerated between the drain signal line DL and the data transfer signalline DTL, which connects respective semiconductor devices of the videosignal drive circuit He. However, it is needless to say that thedisconnection or the like due to a spark generated between the gatesignal line GL and the data transfer signal line which connectsrespective semiconductor devices of the scanning signal drive circuit Vcan be prevented by a constitution similar to the above-mentionedconstitution.

Further, although the above-mentioned image display devices have beendescribed with reference to liquid crystal display devices, as anexample, the present invention also is applicable to so-called organicEL display devices, for example. This is because an organic EL displaydevice includes a pair of electrodes with an organic EL layer disposedtherebetween in the constitution of the pixel and, therefore, hassubstantially the same constitution as the liquid crystal display devicewith respect to other structural features.

As has been explained heretofore, according to the image display deviceof the present invention, when one signal line group and another signalline group, which differs in length from the one signal line group, arearranged close to each other, a disconnection due to static electricitycaused by a spark generated between a signal line of one signal linegroup and a signal line of the other signal line group which arearranged adjacent to each other can be prevented.

1. A liquid crystal display device comprising: a first substrate and asecond substrate with a liquid crystal layer therebetween; a sealmaterial disposed between the first substrate and the second substrateto join the second substrate to the first substrate and to seal theliquid crystal layer sandwiched between the first substrate and thesecond substrate; a plurality of gate signal lines and a plurality ofdrain signal lines, the gate signal lines and the drain signal linesbeing formed on the first substrate; and a plurality of video signaldrive circuits and a plurality of scanning signal drive circuitsconnected to the first substrate; wherein data transmission signal linesare formed on the first substrate, the data transmission signal linesbeing connected electrically between the video signal drive circuits orbetween the scanning signal drive circuits; and wherein at least a partof at least one of the data transmission signal lines between the videosignal drive circuits or between the scanning signal drive circuits isoverlapped with the seal material and arranged between the seal materialand the first substrate.
 2. A liquid crystal display device according toclaim 1, wherein the seal material has a rectangular shape, and the sealmaterial is formed along a peripheral edge of the first substrate andthe second substrate.
 3. A liquid crystal display device according toclaim 1, wherein a semiconductor layer is formed on the first substrateand a metal layer is stacked on the semiconductor layer.
 4. A liquidcrystal display device according to claim 1, wherein the datatransmission signal lines change an extended direction in a position ofthe seal material.
 5. A liquid crystal display device according to claim1, wherein the gate signal lines and the drain signal lines are formednext to the data transmission signal lines, and a dummy signal line isformed between the gate signal lines and the data transmission signallines or between the drain signal lines and the data transmission lines.6. A liquid crystal display device comprising: a first substrate havinga display region; a second substrate; a liquid crystal layer disposedbetween the first substrate and the second substrate within the displayregion; a seal material disposed along a peripheral edge of the secondsubstrate to join the second substrate to the first substrate and toseal the liquid crystal layer disposed between the first substrate andthe second substrate within the display region; gate signal linesarranged, in a first direction, on the first substrate within thedisplay area; drain signal lines arranged, in a second directionperpendicular to the first direction, on the first substrate within thedisplay area; video signal drive circuits and scanning signal drivecircuits arranged in a peripheral region of the first substrate outsidethe display area to drive one or more gate signal lines, drain signallines and data transmission signal lines; and data transmission linesformed on the first substrate between the video signal drive circuits orbetween the scanning signal drive circuits so as to overlap the sealmaterial and arranged between the seal material and the first substrate.7. A liquid crystal display device according to claim 6, wherein thegate signal lines or the drain signal lines are formed next to the datatransmission signal lines, and a dummy signal line is formed between thegate signal lines and the data transmission signal lines or between thedrive signal lines and the data transmission lines.